3.1.1 What is computer network????
💗 Computer network is a collection of computers and devices that are connected together via communication devices an transmission media.
APPLICATION OF NETWORK
- Resources Sharing
💻 Software
- Information Sharing
💻Search capability (www)
- Communication
💻 Message broadcast
COMMUNICATION DEVICE
💗 A communication device is any type of hardware that are capable of transmitting the data, instruction and information between a sending device and a receiving device.
💮 Types of communication devices. 💮
👉 Dial up modem ↣ can convert digital signals to analog signals and analog signals to digital signals, so that data can travel along an analog telephone line.
👉 Digital modem ↣ sends and receive data and information to and from digital line
👉 Wireless modem ↣ some mobile users have a wireless modem that uses the cell phone network to connect to the internet wirelessly from a otebook computer, a smart phone, or other mobile device.
👉 Network card ↣ enables a computer or device that does not have built in networking capability to access a network
👉 Wireless access point ↣ allows computer and devices to transfer data wirelessly among themselves or to transfer data wirelessly to a wired network.
👉 Router ↣ connects multiple computers or other routers together and transmit data
👉 Switch ↣ similar to a hub but more sophisticated
👉 Hub ↣ allows multuiple conections to the network.
TRANSMISSION MEDIA
💗 Materials or substances capable of carrying one or more signals in a communication channel.
💗 There have two types of transmission media which is :-
⏰ Physical transmission media/guided media/wired ⏰
📌 Physical transmission media/guide media/wired.
⇛ (Twisted-pair cable, coaxial cable, fiber-optic cable)
💗 There have two types of transmission media which is :-
⏰ Physical transmission media/guided media/wired ⏰
📌 Physical transmission media/guide media/wired.
⇛ (Twisted-pair cable, coaxial cable, fiber-optic cable)
📌 Wireless transmission media/unguided media/wireless.
⇛ ( infrared, broadcast radio, cellular radio, microwave, communications satelite)
ADVANTAGES OF COMPUTER NETWORK
👍 Easy communicate and speed
" people can communicate efficiently by using email,video conference,chat room,telephony and the others. "
👍 Ability to share files,data and information
"It benefit large organizations to maintain their data in an organized manner and facilitate access to desired people"
👍Sharing hardware and sharing software
" It can reduce the cost of purchasing hardware and reduce the cost of buyer software"
DISADVANTAGES OF COMPUTER NETWORK
👎 Breakdown and loss resourses
" Breakdown whole network due to an issue of the server may lead to loss of important data of the server "
👎 Expensive to build
" especially in large organization because it is needed to buy and replace cables and other hardware"
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